Groundwater is present in a shallow aquifer below Jefferson
Lab.The laboratory has structures, including
two operational accelerators, at or below the water table that have the
potential to impact the groundwater.To
mitigate actual and potential impacts to the groundwater, the laboratory, under
its Environmental
Management System (EMS), has instituted a comprehensive site wide
groundwater protection program.This program addresses:

Minimizing the impact to
site wide groundwater quality due to accelerator operations,

Maintaining the
groundwater dewatering system (both collection and discharge) that serves
the experimental halls to prevent flooding.

Minimizing the impact to
surface water quality with the discharge of the dewatered groundwater to
the surface.

This groundwater protection program complies with Federal government and
Commonwealth of Virginia groundwater quality laws and regulations and two
permits: VA0089320 (ground and surface water quality) and GW0047200
(dewatering).The program also implements
the contract requirements of DOE Order 458.1, Radiation Protection of the
Public and the Environment.

The
purpose of the Groundwater
Protection Program Plan (EPS 31) is to minimize the facility’s impact on
groundwater resources, primarily through a comprehensive site-wide groundwater
monitoring program that identifies and assesses the effect of current and
future activities on groundwater quantity and quality.

·Manages
the disposal of activated water to ensure it does not migrate to the soil
and/or groundwater.

·Input sampling and other information into the DEQ Database and inform
TJSO.

3.0Summay of Groundwater Protection Program

The four operational concerns that could potentially
impact groundwater are:

The potential for radiological contamination of
the groundwater;

The withdrawal of groundwater from under the
below-grade experimental halls.This water is discharged to the surface via drainage pathways that
lead to Big Bethel Reservoir;

The temporary withdrawal of groundwater
from construction activities; and

The small potential to
exceed the permitted maximum monthly and annual withdrawal quantities.

Jefferson Lab’s groundwater protection program is a comprehensive
site wide groundwater assessment strategy to minimize the effect of current and
future Lab activities on groundwater quantity and quality.This program includes:

Maintaining an effective
dewatering system at the end stations to prevent damage to the building
and equipment within the halls.

Anticipating dewatering
requirements in construction projects in advance can allow time for review
and to take necessary actions, such as obtaining a dewatering permit.

Having a preoperational
sampling result baseline to compare with current sampling results.

Regular sampling that helps
determine potential effects from operations and enables necessary actions
to identify and fix a possible issue.

Accelerator and FEL Divisions operating within
safety envelopes and following ALARA to minimize impact to people, the
earth, groundwater, and or the public.

Radiation Control performing all activities required
under the VPDES (VA0089320) permit by monitoring processes to identify
issues that could receive attention before it becomes a problem, including
a mission critical one.

ESH&Q ensuring permit submittal
requirements are met.

The potential activation sources of most concern (the Halls and
the Beam Switchyard) were the basis for design of the Jefferson Lab groundwater
monitoring network.Since groundwater
activation and transport occur over a relatively long time frame, retrospective
sampling and analysis is adequate for identifying and mitigating problems. Wells are sampled twice yearly under the terms of the
VPDES Permit for the radiological parameters Tritium, Beryllium-7, Sodium-22,
and Manganese-54.

No activation is expected under the end
stations, the site of the groundwater collection network. The
dewatering operation provides for collection and discharge through a pump
network at the Counting House. The water is sampled annually for Tritium,
Beryllium-7, Sodium-22, and Manganese-54. Additional samples are continuously
collected and analyzed by RadCon.

This document is
controlled as an on line file.It may be
printed but the print copy is not a controlled document.It is the user’s responsibility to ensure
that the document is the same revision as the current on line file.This copy was printed on 6/4/2013.